4.1 Rising and Falling Temperatures 0910

LLRAccentuate the Negative
Big Idea
Do negative numbers help us to model many real world situations?
Problem 4.1 Rising and Falling TemperaturesA1. Suppose the temperature changed by an average of +3 degrees per hour for a 10-hour period. Copy and complete the table and use it to find out the total temperature change for the first 5 hours.

Number of Hours	1	2	3	4	5
Total Temperature change (degrees C)	+3	+6	+9	+12	+15

A2. Write a multiplication sentence that represents the total change in the temperature for the first 5 hours. Write a multiplication sentence that represents the temperature change for the 10 hour period.
3x5= 15 (5 hour period)
3x10= 30 (10 hour period)

B1.

Number of Hours	1	2	3	4	5
Total Temperature change	-3	-6	-9	-12	-15

B2.Write a multiplication sentence that represents the total change in the temperature for the first 5 hours. Write a multiplication sentence that represents the temperature change for the 10 hour period.
3x5= 15 (5 hour period)
3x10= 30 (10 hour period)
C1. Write the addition sentence illustrated by each diagram
a)2+4+6
b) -3+-6
c)-2+-4+-6+-8

C2.
a) 2x6x8
b)-3x-6
c)-2x-4x-6x-8

D.

Number of Hours	1	2	3	4	5
Total Temperature change	-2	-4	-6	-8	-10

E.
1. 5x-4=20
2. 20x-4=80
3. -4x20=80
4. 5x4=20